3M makes a really good set of films to reduce both glare and solar gain — we had them put on some very large windows and it's definitely a difference. You have

3M makes a really good set of films to reduce both glare and solar gain — we had them put on some very large windows and it's definitely a difference. You have to go through a 3M contractor which is the only annoying aspect (although it's not a job I would have enjoyed doing so having a pro do it worked out in our case.)